0.39×1.4×2.5的简便计算
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0.39×1.4×2.5
=(0.4-0.01)×0.7×2×2.5
=(0.4-0.01)×0.7×5
=0.4×3.5-0.035
=1.4-0.035
=1.365
=(0.4-0.01)×0.7×2×2.5
=(0.4-0.01)×0.7×5
=0.4×3.5-0.035
=1.4-0.035
=1.365
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0.39×1.4×2.5
=(0.4-0.01)×2.5×1.4
=(0.4×2.5-0.01×2.5)×1.4
=(1-0.025)×1.4
=1.4-(0.025+0.01)
=1.365
=(0.4-0.01)×2.5×1.4
=(0.4×2.5-0.01×2.5)×1.4
=(1-0.025)×1.4
=1.4-(0.025+0.01)
=1.365
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本题没有特别简便的算法,可以参考如下:
0.39×1.4×2.5
=1.4×2.5×0.39
=2×2.5×0.7×0.39
=5×0.7×0.39
=3.5×0.39
=3.5×(0.4-0.01)
=3.5×0.4-3.5×0.01
=1.4-0.035
=1.365
0.39×1.4×2.5
=1.4×2.5×0.39
=2×2.5×0.7×0.39
=5×0.7×0.39
=3.5×0.39
=3.5×(0.4-0.01)
=3.5×0.4-3.5×0.01
=1.4-0.035
=1.365
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